摘要
以国内外红茶为材料,采用电感耦合等离子体质谱仪(ICP-MS)测定样品中铜(Cu)、铅(Pb)、砷(As)、汞(Hg)、铬(Cr)、镉(Cd)以及16种稀土元素含量(以氧化物总量ΣRe Os计)。在此基础上根据《绿色食品茶、有机茶、食品中污染物限量》等国家和行业标准中对重金属含量进行安全性评价。结果表明,所有样品中Pb含量均低于5μg/g,满足国标中对茶叶Pb的限量要求。根据《有机茶》标准,1个样品Pb含量不符合要求,3个样品Cu含量不满足该标准的限量要求。从《绿色食品茶叶》标准来看,3个样品不满足该标准对重金属的限量要求。从NY 659—2003《茶叶中铬、镉、汞、砷及氟化物限量》标准的要求来看,2份样品Cr含量超出该标准。稀土元素的分析结果表明,10个样品稀土氧化物总量超标(>2 mg/kg)。总体来看,该批茶叶样品重金属的合格率为72.97%。
Using black teas at home and abroad as materials, inductively coupled plasma mass spectro-meter （ICP-MS） method was adopted to determine the content of （Cu） , lead （Pb） , arsenic （ As） , mer-cury （Hg） , chromium （Cr） , cadmium （Cd） and 16 rare-earth elements （ counted by total amount of ox-ides ΣReOs）. And on this base we evaluated the safety of the heavy metal according to national and in-dustrial standards including “ Green Food Tea, Organic Tea and Maximum Levels of Contaminants in Foods” .The result showed that content of Pb in all samples was lower than 5 μg which met the limita-tion of national standard about Pb in teas. According to organic tea, one sample did not meet this stand-ard about Pb content and three samples did not meet this standard about Cu content. According to green food tea, three samples did not meet this standard about heavy metal content. According to NY 659- 2003 “Residue Limits for Chromium, Cadmium, Mercury, Arsenic and Fluoride in tea” ,Cr content in two samples was beyond this standard. Result of rare-earth metal showed that ΣReOs in 10 samples were out of range of 2 mg/kg. On the whole, the pass rate of tea samples about heavy metal was 72. 9 7 % .
出处
《食品科学技术学报》
CAS
2017年第1期87-94,共8页
Journal of Food Science and Technology
基金
现代农业产业技术体系专项资金项目(CARS-23)
广东省科技计划项目(2015A020210078
粤科规财字[2014]208号
2015B090906027
2013A061402003)
英德市科技计划项目(英经信字[2014]65号)
关键词
红茶
重金属
稀土元素
安全性评价
black tea
heavy metal
rare-earth elements
safety evaluation
